When do I adjust `humid? or `dry? measurement settings? (for Fibox 4 / trace, Microx 4 / trace, OXY-1 SMA/trace, OXY-1 ST/trace, OXY-1 WM/trace)

For measurements at humidity ≥ 50 % and for liquids you have to set `humid?; measurements below 50 %  humidity are performed in `dry? mode.